Bug with keyboard input

[AllyTally]

When you right click something like a block in scratch.mit.edu (which uses flash), you cannot input text. You have to log out of Master Password +, and log back in to fix it. It's very annoying to do.
Example of this happening: https://files.catbox.moe/8e5mrz.gif

[vanowm]

I can't reproduce it on that website. Is that only with virtual keyboard?

[AllyTally]

No, that was just to show what keys I'm using.
If you need, I'm using Firefox Developer Edition, and not normal Firefox.

[vanowm]

I'm testing it on Windows 10 x64 and Firefox latest stable and nightly, following your video I can't reproduce, everything works fine. Can you confirm there is no conflict with other extensions (by disabling everything else)?

[AllyTally]

Disabled everything but uBlock, problem persists.
Although I found out if I alt+tab to a different window, and alt+tab back to the browser keyboard input seems to work fine again, until I right click in the scratch editor.

[vanowm]

And can you confirm the problem disappear if you disable MP+?

I won't be able to help if I can't reproduce on my end.